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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Investments    
Equity securities $ 233 $ 226
Government debt securities 147 142
Corporate debt securities 393 373
Mortgage and asset-backed securities 50 49
Institutional mutual funds 96 94
Forward debt securities contracts 37 19
Private equity funds measured at net asset value(1) [1] 137 136
Private real estate funds measured at net asset value(1) [1] 115 113
Commingled funds measured at net asset value(1) [1] 1,506 1,451
Total investments 2,714 2,603
Currency swap 1  
Commodity contract derivatives 16 10
Total 2,731 2,613
Liabilities    
Currency swaps [2] 66 103
Interest rate swaps 1,454 1,511
Commodity contract derivatives 93 70
Swap contracts [2]   1
Total 1,613 1,685
Fair Value, Inputs, Level 1    
Investments    
Equity securities 233 226
Government debt securities 78 100
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 96 94
Forward debt securities contracts 0 0
Private equity funds measured at net asset value(1) [1] 0 0
Private real estate funds measured at net asset value(1) [1] 0 0
Commingled funds measured at net asset value(1) [1] 0 0
Total investments 407 420
Currency swap 0  
Commodity contract derivatives 0 0
Total 407 420
Liabilities    
Currency swaps [2] 0 0
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Swap contracts [2]   0
Total 0 0
Fair Value, Inputs, Level 2    
Investments    
Equity securities 0 0
Government debt securities 69 42
Corporate debt securities 393 373
Mortgage and asset-backed securities 50 49
Institutional mutual funds 0 0
Forward debt securities contracts 37 19
Private equity funds measured at net asset value(1) [1] 0 0
Private real estate funds measured at net asset value(1) [1] 0 0
Commingled funds measured at net asset value(1) [1] 0 0
Total investments 549 483
Currency swap 1  
Commodity contract derivatives 7 8
Total 557 491
Liabilities    
Currency swaps [2] 66 103
Interest rate swaps 1,454 1,511
Commodity contract derivatives 11 1
Swap contracts [2]   1
Total 1,531 1,616
Fair Value, Inputs, Level 3    
Investments    
Equity securities 0 0
Government debt securities 0 0
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 0 0
Forward debt securities contracts 0 0
Private equity funds measured at net asset value(1) [1] 0 0
Private real estate funds measured at net asset value(1) [1] 0 0
Commingled funds measured at net asset value(1) [1] 0 0
Total investments 0 0
Currency swap 0  
Commodity contract derivatives 9 2
Total 9 2
Liabilities    
Currency swaps [2] 0 0
Interest rate swaps 0 0
Commodity contract derivatives 82 69
Swap contracts [2]   0
Total $ 82 $ 69
[1] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
[2] Due to the right of setoff and method of settlement, TVA elects to record commodity derivatives under the FTP based on its net commodity position with the counterparty or FCM. Deposits are made to TVA's margin cash accounts held with each FCM to offset any net liability positions in full for derivatives that are transacted with FCMs. TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 13 — Offsetting of Derivative Assets and Liabilities.